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cpu/samd21: add helper functions spi_power_on/off

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This commit is contained in:
Kees Bakker 2016-08-15 22:49:48 +02:00
parent 2a4655b6f8
commit 574b565e2a
1 changed files with 43 additions and 15 deletions
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58
cpu/samd21/periph/spi.c
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@ -31,6 +31,16 @@
#include "debug.h" #include "debug.h"
#if SPI_0_EN || SPI_1_EN #if SPI_0_EN || SPI_1_EN
/**
* @brief Internal helper function to do the actual work for spi_poweroff
*/
static void _spi_poweroff(SercomSpi* spi_dev);
/**
* @brief Internal helper function to do the actual work for spi_poweron
*/
static void _spi_poweron(SercomSpi* spi_dev);
/** /**
* @brief Array holding one pre-initialized mutex for each SPI device * @brief Array holding one pre-initialized mutex for each SPI device
*/ */
@ -177,8 +187,10 @@ int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
default: default:
return -1; return -1;
} }
spi_dev->CTRLA.bit.ENABLE = 0; /* Disable spi to write confs */
while (spi_dev->SYNCBUSY.reg) {} /* Disable spi to write confs */
_spi_poweroff(spi_dev);
spi_dev->CTRLA.reg |= SERCOM_SPI_CTRLA_MODE_SPI_MASTER; spi_dev->CTRLA.reg |= SERCOM_SPI_CTRLA_MODE_SPI_MASTER;
while (spi_dev->SYNCBUSY.reg) {} while (spi_dev->SYNCBUSY.reg) {}
@ -193,7 +205,9 @@ int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
while (spi_dev->SYNCBUSY.reg) {} while (spi_dev->SYNCBUSY.reg) {}
spi_dev->CTRLB.reg = (SERCOM_SPI_CTRLB_CHSIZE(0) | SERCOM_SPI_CTRLB_RXEN); spi_dev->CTRLB.reg = (SERCOM_SPI_CTRLB_CHSIZE(0) | SERCOM_SPI_CTRLB_RXEN);
while(spi_dev->SYNCBUSY.reg) {} while(spi_dev->SYNCBUSY.reg) {}
spi_poweron(dev);
/* enable */
_spi_poweron(spi_dev);
return 0; return 0;
} }
@ -258,37 +272,51 @@ int spi_transfer_byte(spi_t dev, char out, char *in)
return 1; return 1;
} }
static void _spi_poweron(SercomSpi* spi_dev)
{
if (spi_dev == NULL) {
return;
}
spi_dev->CTRLA.reg |= SERCOM_SPI_CTRLA_ENABLE;
while (spi_dev->SYNCBUSY.bit.ENABLE) {}
}
void spi_poweron(spi_t dev) void spi_poweron(spi_t dev)
{ {
switch(dev) { switch(dev) {
#ifdef SPI_0_EN #if SPI_0_EN
case SPI_0: case SPI_0:
SPI_0_DEV.CTRLA.reg |= SERCOM_SPI_CTRLA_ENABLE; _spi_poweron(&SPI_0_DEV);
while(SPI_0_DEV.SYNCBUSY.bit.ENABLE) {}
break; break;
#endif #endif
#ifdef SPI_1_EN #if SPI_1_EN
case SPI_1: case SPI_1:
SPI_1_DEV.CTRLA.reg |= SERCOM_SPI_CTRLA_ENABLE; _spi_poweron(&SPI_1_DEV);
while(SPI_1_DEV.SYNCBUSY.bit.ENABLE) {}
break; break;
#endif #endif
} }
} }
static void _spi_poweroff(SercomSpi* spi_dev)
{
if (spi_dev == NULL) {
return;
}
spi_dev->CTRLA.bit.ENABLE = 0; /* Disable spi */
while (spi_dev->SYNCBUSY.bit.ENABLE) {}
}
void spi_poweroff(spi_t dev) void spi_poweroff(spi_t dev)
{ {
switch(dev) { switch(dev) {
#ifdef SPI_0_EN #if SPI_0_EN
case SPI_0: case SPI_0:
SPI_0_DEV.CTRLA.bit.ENABLE = 0; /* Disable spi */ _spi_poweroff(&SPI_0_DEV);
while(SPI_0_DEV.SYNCBUSY.bit.ENABLE) {}
break; break;
#endif #endif
#ifdef SPI_1_EN #if SPI_1_EN
case SPI_1: case SPI_1:
SPI_1_DEV.CTRLA.bit.ENABLE = 0; /* Disable spi */ _spi_poweroff(&SPI_1_DEV);
while(SPI_1_DEV.SYNCBUSY.bit.ENABLE) {}
break; break;
#endif #endif
} }